lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 05 Apr 2024 02:06:26 -0500
From: John Bauer via B4 Relay <devnull+johnebgood.securitylive.com@...nel.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linh.tp.vu@...il.com, ribalda@...omium.org, soyer@....hu, 
 John Bauer <johnebgood@...uritylive.com>
Subject: [PATCH 1/2] media: uvcvideo: UVC minimum relative pan/tilt/zoom
 speed fix.

From: John Bauer <johnebgood@...uritylive.com>

The minimum UVC control value for the relative pan/tilt/zoom speeds
cannot be probed as the implementation condenses the pan and tilt
direction and speed into two 16 bit values. The minimum cannot be
set at probe time because it is probed first and the maximum is not
yet known. With this fix if a relative speed control is queried
or set the minimum is set and checked based on the additive inverse of
the maximum at that time.

Signed-off-by: John Bauer <johnebgood@...uritylive.com>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index e59a463c2761..b389ab3ee05d 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1322,9 +1322,25 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 		break;
 	}
 
-	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN)
-		v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN,
-				     uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
+	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN) {
+		switch (v4l2_ctrl->id) {
+		case V4L2_CID_ZOOM_CONTINUOUS:
+		case V4L2_CID_PAN_SPEED:
+		case V4L2_CID_TILT_SPEED:
+			/*
+			 * For the relative speed implementation the minimum
+			 * value cannot be probed so it becomes the additive
+			 * inverse of maximum.
+			 */
+			v4l2_ctrl->minimum = -1 * mapping->get(mapping, UVC_GET_MAX,
+						uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
+			break;
+		default:
+			v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN,
+						uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
+			break;
+		}
+	}
 
 	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX)
 		v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX,
@@ -1914,6 +1930,21 @@ int uvc_ctrl_set(struct uvc_fh *handle,
 				   uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
 		max = mapping->get(mapping, UVC_GET_MAX,
 				   uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
+
+		/*
+		 * For the relative speed implementation the minimum
+		 * value cannot be probed so it becomes the additive
+		 * inverse of maximum.
+		 */
+		switch (xctrl->id) {
+		case V4L2_CID_ZOOM_CONTINUOUS:
+		case V4L2_CID_PAN_SPEED:
+		case V4L2_CID_TILT_SPEED:
+			min = max * -1;
+		default:
+			break;
+		}
+
 		step = mapping->get(mapping, UVC_GET_RES,
 				    uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
 		if (step == 0)

-- 
2.34.1



Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ